Furnace unit



F. F. JACKSON FURNACE UNIT Nov. 3, 1936.

Filed June 30, 1934 INVENTOR. firank qfac/w g BY 21 m 9, 4 ATTORN 8Patented Nov. 3, 1936 UNITED STATES PATENT OFFICE FURNACE UNIT Frank F.Jackson, Cleveland, Ohio Application June 30, 1934, Serial No. 733,262

7 1 Claim. (Cl. 263-6) This invention relates as indicated tofurticularly pointed out in the claim; the annexed nace units and moreparticularly to the condrawing and the following description settingstruction of a work-conveying roll adapted for forth in detail certainstructure embodying the use in metallurgical furnaces such-asnormalinvention, such disclosed means constituting,

izing furnaces, etc. however, but one of various structural forms in 5More particularly, my invention relates to the which the principle ofthe invention may be used: construction of a so-called dry roll, i. e.,a roll In said annexed drawing:- which is journaled in stationarybearings on op- Fig. 1 is a fragmentary transverse sectional positesides of the furnace, extending through view of a metallurgical furnaceshowing a con- 10 the furnace to movably support work thereon veyor rollconstructed in accordance with the 10 and not being provided with meansfor circulatprinciples of my invention associated therewith; ing acooling medium such as water there- Fig. 2 is a fragmentary sectionalview drawn to through. an enlarged scale of a portion of the roll illus-A certain amount of difficulty has been extrated in the previo figureShowing p perienced in the past with conveyor rolls of this larly themode of connection between the cen- 15 type, particularly due to thefact that the central and terminal sections of the roll; Fig. 3 is atral portions of such rollers are at all times subtransverse sectionalview of the roll as illustrated jected to the intense heat of thefurnace and no in Fig. 2 taken on a plane substantially indicated meansis provided whereby the same are interby the line 3-3; and Fig. 4 is afragmentary nally cooled. I developed View of one terminal portion ofthe 20 Due particularly to the width of the furnaces, central section ofthe roller illustrated in the i. e., the length of that portion of therolls subprevious figures. jected to the intense heat of the furnace,rolls Referring now more specifically to the drawof this characterusually fail in their central ing a d more espe y 1, the furnaceportions long before the terminal portions are unit or conveyor rollcomprising my invention is 25 Worn out. shown associated with ametallurgical furnace It is among the objects of my invention to prosuchas a normalizing furnace generally individe conveyor rolls formetallurgical furnaces cated at l. The furnace I is shown as providedcharacterized by the provision of a central secwith the usual side walls2 through which extend tion joined to terminal sections in a particularopenings 3 arranged to receive the roll compris- 30 manner so that thecentral sections may be ing my invention. Suitable frame work suchreadily replaced after failure and so that the as generally indicated at4 is provided on opterminal portions may be used until worn out positesides of the furnace on which are mounted and the operating cost of suchrolls consequently bearing blocks generally indicated at 5 in whichmaterially reduced. the journals of the roll rotate. The roll gen- 35 Itis a further object of my invention to proerally indicated at 6 extendsas at I through vide a work supporting roll for furnaces of the one ofthe bearings 5 and has some means such above described character whereinthe central as a sprocket 8 secured thereto and by which the section isso secured to the terminal sections that same may be driven.

the central sections may be readily replaced As previously indicated, myinvention pertains 40 while at the same time maintaining a sufficientlyparticularly to the construction of a roll comstructurally soundconnection between the cenprising a plurality of sections which areassemtral and terminal portions so as to in no way inbled in aparticular manner to form a composite terfere with the operation of theroll. structure characterized by the fact that the cen- It is a furtherobject of my invention to protral portion thereof may be renewed afterfailure. 45 vide a roll of the character described in which Asillustrated in Fig. 1, the terminal portions 9 the central section isformed from a centrifugal and H] of the roll are, inwardly of theirjournal casting; thus making possible the utilization of portions,flared so as to provide a relatively large a structure which is superiorto any previously diameter to which the central section may beconavailable. veniently secured. The central section generally 50 Otherobjects of my invention will appear as indicated at H is preferably inthe form of a cylthe description proceeds. inder. The inner ends of theterminal sections To the accomplishment of the foregoing and 9 and I0are provided with reduced cylindrical related ends, said invention,then, consists of extensions l2 having an outside diameter subthe meanshereinafter fully described and parstantially equal to the insidediameter of the 5 terminals of the central section I I. A shouldergenerally indicated at I3 is provided on the terminal sections for thepurpose hereinafter more fully explained.

As most clearly illustrated in Figs. 2 to 4 the terminal portions of theintersection H are provided with a plurality of spaced staggered rows ofopenings I4 extending therethrough. After the parts have been assembledinto the position illustrated in Fig. 1, weld metal, preferably of someheat resistant composition, is deposited in the openings l4, keying thecentral and terminal sections securely together.

The preferred mode of assembling the central and terminal sections maybe as follows: The central section without the openings M in theterminal portions thereof is telescopically engaged with the cylindricalprojections l2 of the terminal sections 9 and i8 until the ends of thecentral section abut the shoulders l3 on the terminal sections. Afterthe parts have been brought into such assembled relation, the openingsI4 are drilled in the central section; the points of the drill formingsuch holes penetrating for a short distance into the cylindricalextensions on the terminal sections. After such drill holes are formed,the same are filled with weld metal in the manner hereinbeforeexplained, such weld metal filling the shallow openings formed in theterminal sections by the points of the drills, thereby insuring a morepositive connection between the several sections of the roll.

A plurality of annular work supporting members generally indicated at l5are secured in axially spaced relation on the central portion of theroll.

Should a roll fail due to a deterioration of the central sectionthereof, such roll may be repaired by inserting a new central section bythe following procedure:

The central section will be sawed off adjacent the inner ends of theterminal sections; the terminal sections will then be placed in a latheand the terminal portion with the central section remaining on theterminal sections will be turned down by the usual lathe operation. Inorder to facilitate the supporting of the terminal sections in the lathefor this turning down operation, such sections are provided with atransversely extending bar or brace generally indicated at l6 which may,at an axis of the section, be provided with an opening or recess to beengaged by the head or tail stock of the lathe.

After the terminal sections have been thus turned down to substantiallytheir original size and shape, a new central section may be assembledtherewith and united thereto in the manner heretofore explained.

As previously indicated, the central section is preferably formed from acentrifugal casting. The assembly of a composite roll from a pluralityof elements in accordance with the principles of my invention makespossible the use of a centrifugal casting in the center section of theroll which is not possible when the entire roll is made in one piece.Use of a centrifugal casting in the central section is advantageous forthe reason that it is possible to maintain closer tolerance in acentrifugal casting than in the common form of casting and furthermore,the structural strength of a thin-walled centrifugal casting of thischaracter is believed to be superior to that of the usual type casting.The possibility of maintaining closer tolerance in a centrifugal castingenables me to form the central section with a uniform wall section whichis relatively thin. This is a particular advantage when it is rememberedthat rolls of this character fail primarily due to their own weight,rather than due to the Weight of the material supported thereon. It isadvantageous, therefore, to form the wall of the central section as thinas possible in order to reduce the weight but not too thin in order thatweak sections may occur. It is to the solution of this last namedproblem that a centrifugal casting for the central section isparticularly applicable and the use of the centrifugal casting in thecentral section is made possible only by the assembly of a plurality ofelements to form a complete roll.

The telescopic engagement of the parts at the juncture between thecentral and terminal sections of the roll produces a very strong, highlyefficient joint between the parts, one which does not rely uponauxiliary connecting means such as keys and bolts to carry the stress towhich the roll is subjected, and a connection which is particularlyapplicable to the replacement of the central section.

Other forms may be employed embodying the features of my inventioninstead of the one here explained, change being made in the form orconstruction, provided the elements stated by the following claim or theequivalent of such stated elements be employed.

I, therefore, particularly point out and distinctly claim as myinvention:-

A conveyor roll for furnaces comprising terminal sections respectivelyprovided at their outer ends with journals by which the roll may berotatably supported and at their inner ends with substantiallycylindrical extensions, a radially and circumferentially extendingabutment on each of said terminal sections at the outer ends of saidextensions, the face of said abutment lying in a plane normal to theaxis of said journals, a central cylindrical section telescopicallyengaging said extensions and terminally engaging said abutment faces,said central section and extensions provided with a plurality ofcircumferentially and axially spaced openings extending through the wallof said central section and partially through the wall of saidextensions, and weld metal filling said openings and securing togethersaid central and terminal sections.

FRANK F. JACKSON.

